US8861132B2 - Low friction tape head and system implementing same - Google Patents
Low friction tape head and system implementing same Download PDFInfo
- Publication number
- US8861132B2 US8861132B2 US12/831,149 US83114910A US8861132B2 US 8861132 B2 US8861132 B2 US 8861132B2 US 83114910 A US83114910 A US 83114910A US 8861132 B2 US8861132 B2 US 8861132B2
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- United States
- Prior art keywords
- tape
- magnetic
- bearing surface
- central portion
- tape bearing
- Prior art date
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- Expired - Fee Related, expires
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/62—Maintaining desired spacing between record carrier and head
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/008—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires
- G11B5/00813—Recording on, or reproducing or erasing from, magnetic tapes, sheets, e.g. cards, or wires magnetic tapes
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/1871—Shaping or contouring of the transducing or guiding surface
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/255—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for protection against wear
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/265—Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/29—Structure or manufacture of unitary devices formed of plural heads for more than one track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3103—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
- G11B5/3106—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing where the integrated or assembled structure comprises means for conditioning against physical detrimental influence, e.g. wear, contamination
Definitions
- the present invention relates to data storage systems, and more particularly, this invention relates to a low friction tape head.
- the tape media having a thinner magnetic coating
- the tape media has become smoother.
- smoother tape media has resulted in higher levels of static and running friction on the head.
- a magnetic tape is moved over the surface of the tape head at high speed. If the tape is rough, this movement generally entrains a film of air between the head and tape.
- smoother tape media does not entrain as much air, resulting in more intimate contact between head and tape thereby increasing running friction.
- Static friction also known as “stiction,” at the head-tape interface of a tape drive can be a significant issue.
- the stiction forces for smooth tapes can be so high that a drive cannot cause the tape medium to come free from the head. If excessive force is used to move the tape, the tape may become damaged or even break.
- a magnetic data storage system includes a magnetic head; and guides on opposite sides of the magnetic head for directing a magnetic medium over the magnetic head.
- the magnetic head includes: outer portions each having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers; and a central portion positioned between the outer portions, the central portion having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers.
- An inner edge of each of the tape bearing surfaces of the outer portions is adapted for skiving air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the respective outer portion.
- the guides are oriented to direct the magnetic medium to fly over a leading one of the outer portions, engage a leading edge of the tape bearing surface of the central portion, and engage an inner edge of the tape bearing surface of a trailing one of the outer portions.
- a magnetic head includes outer portions each having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers; and a central portion positioned between the outer portions, the central portion having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers.
- the outer edges of the tape bearing surfaces of the outer portions are non-skiving, and an inner edge of each of the tape bearing surfaces of the outer portions is adapted for skiving air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the respective outer portion.
- a method includes guiding a magnetic medium over a magnetic head at an angle at which the magnetic medium flies over a leading outer portion of the head, the magnetic medium engages a leading edge of a tape bearing surface of a central portion of the head, and the magnetic medium engages an inner edge of a tape bearing surface of a trailing outer portion of the head.
- the inner edge of the tape bearing surface of the trailing outer portions skives air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the trailing outer portion.
- a method for setting a wrap angle includes adjusting a guide position to overwrap a magnetic tape over an outer edge of a leading outer potion of a magnetic head having the leading outer portion, a trailing outer portion, and a central portion positioned between the outer portions.
- Each portion has a tape bearing surface and an array of transducers selected from a group consisting of readers and writers.
- the magnetic tape is passed over the head, the tape traveling in a direction from the leading outer portion towards the trailing outer portion.
- the magnetic tape is read using the leading outer portion.
- a wrap angle of the magnetic tape relative to the leading outer portion is adjusted until the tape is no longer readable.
- a position of the guide when the tape becomes no longer readable is determined.
- a wrap angle is selected based on the determined position of the guide.
- the guide is set to provide the selected wrap angle.
- a magnetic data storage system such as a tape drive system, which may include a magnetic head, a drive mechanism for passing a magnetic medium (e.g., recording tape) over the magnetic head, and a controller electrically coupled to the magnetic head.
- a magnetic medium e.g., recording tape
- FIG. 1 illustrates a traditional flat-lapped magnetic tape head, in accordance with the prior art.
- FIG. 2 is an enlarged view of Circle 2 of FIG. 1 , showing a first known effect associated with the use of the head of FIG. 1 .
- FIG. 3 is a side view of a magnetic tape head with three portions according to one embodiment of the present invention.
- FIG. 4 is a side view of a magnetic tape head with three portions in use according to one embodiment of the present invention.
- FIG. 5 is a side view of a magnetic tape head with three portions in use according to one embodiment of the present invention.
- FIG. 6 is a tape bearing surface view of a portion of a tape head having patterning according to one embodiment.
- FIG. 7 is a cross sectional view taken from Line 7 - 7 of FIG. 6 .
- FIG. 8 is a schematic diagram of the tape drive system.
- a magnetic data storage system includes a magnetic head; and guides on opposite sides of the magnetic head for directing a magnetic medium over the magnetic head.
- the magnetic head includes: outer portions each having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers; and a central portion positioned between the outer portions, the central portion having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers.
- An inner edge of each of the tape bearing surfaces of the outer portions is adapted for skiving air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the respective outer portion.
- the guides are oriented to direct the magnetic medium to fly over a leading one of the outer portions, engage a leading edge of the tape bearing surface of the central portion, and engage an inner edge of the tape bearing surface of a trailing one of the outer portions.
- a magnetic head in another general embodiment, includes outer portions each having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers; and a central portion positioned between the outer portions, the central portion having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers.
- the outer edges of the tape bearing surfaces of the outer portions are non-skiving, and an inner edge of each of the tape bearing surfaces of the outer portions is adapted for skiving air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the respective outer portion.
- a method in another general embodiment, includes guiding a magnetic medium over a magnetic head at an angle at which the magnetic medium flies over a leading outer portion of the head, engages a leading edge of a tape bearing surface of a central portion of the head, and engages an inner edge of a tape bearing surface of a trailing outer portion of the head.
- the inner edge of the tape bearing surface of the trailing outer portions skives air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the trailing outer portion.
- a method for setting a wrap angle includes adjusting a guide position to overwrap a magnetic tape over an outer edge of a leading outer potion of a magnetic head having the leading outer portion, a trailing outer portion, and a central portion positioned between the outer portions, each portion having a tape bearing surface and an array of transducers selected from a group consisting of readers and writers; passing the magnetic tape over the head, the tape traveling in a direction from the leading outer portion towards the trailing outer portion; reading the magnetic tape using the leading outer portion; adjusting a wrap angle of the magnetic tape relative to the leading outer portion until the tape is no longer readable; determining a position of the guide when the tape becomes no longer readable; selecting a wrap angle based on the determined position of the guide; and setting the guide to provide the selected wrap angle.
- FIG. 1 illustrates a traditional flat-lapped bi-directional, two-module magnetic tape head 100 , in accordance with the prior art.
- the head includes a pair of bases 102 , each equipped with a module 104 .
- the bases are typically “U-beams” that are adhesively coupled together.
- Each module includes a substrate 104 A and a closure 104 B with readers and writers 106 situated therebetween.
- a tape 108 is moved over the modules along a tape bearing surface 109 in the manner shown for reading and writing data on the tape using the readers and writers.
- a partial vacuum is formed between the tape and the tape bearing surface for maintaining the tape in close proximity with the readers and writers.
- One parameter includes the tape wrap angles ⁇ i , ⁇ o defined between the tape and a plane 111 in which the upper surface of the tape bearing surface resides.
- the tape wrap angles ⁇ i , ⁇ o include an inner wrap angle ⁇ i which is often similar in degree to an external, or outer, wrap angle ⁇ o .
- the tape bearing surfaces of the modules are set at a predetermined angle relative to each other such that the desired inner wrap angle ⁇ i is achieved at the facing edges.
- a tape bearing surface length 112 is defined as the distance (in the direction of tape travel) between opposite edges of the tape bearing surface.
- FIG. 2 is an enlarged view of the area encircled in FIG. 1 .
- FIG. 2 illustrates a first known effect associated with the use of the head 100 of FIG. 1 .
- the tape 108 moves across the head as shown, air is skived from below the tape by a skiving edge 204 of the substrate 104 A, and instead of the tape 108 lifting from the tape bearing surface 109 of the module (as intuitively it should), the reduced air pressure in the area between the tape and the tape bearing surface results from skiving and causes atmospheric pressure to urge the tape towards the tape bearing surface.
- a problem with such designs is that running friction is added at each location where the tape wraps an edge, i.e., the four edges of the modules of FIG. 1 . Particularly, at each wrapped edge, the contact pressure between the head and the tape is higher, resulting in higher rubbing friction. That ultimately requires more energy to pull the tape across the head. Moreover, multiple wraps put more stress on the tape and cause more tape wear.
- the worst effect of wrapping the corners is that it can launch acoustic waves in the tape.
- the tape tends to stick momentarily and then break free, thus launching the acoustic waves.
- the waves causes the velocity of the tape at the head-tape interface to oscillate.
- the acoustic wave is a compressional wave running in the plane of the tape, resulting in a standing wave between tape supports and causing the tape velocity to oscillate at the head-tape interface.
- the resultant jitter at the tape-head interface is small, it is enough to cause detection problems. When the tape is running very slowly, this effect becomes more noticeable.
- FIG. 3 illustrates a magnetic data storage system 300 according to one embodiment of the present invention that includes a magnetic head 302 and guides 304 , 306 on opposite sides of the magnetic head for directing a magnetic medium 308 over the magnetic head.
- the magnetic medium is a tape medium.
- the magnetic head includes outer portions 310 , 312 , each having a tape bearing surface 314 , 315 that is preferably flat lapped, and an array of transducers selected from a group consisting of readers and writers of any type, including those known in the art.
- a central portion 316 is positioned between the outer portions.
- the central portion also has a tape bearing surface and an array of transducers selected from a group consisting of readers and writers.
- the medium is shown extending across the head and at rest (not in motion).
- the medium rests on the tape bearing surface of the central portion, and has minimal contact with the inner edges 318 , 320 of each of the tape bearing surfaces of the outer portions.
- the position of the inner edges of each of the tape bearing surfaces of the outer portions relative to the plane of the tape bearing surface of the central portion determines the tape wrap angle between the plane of the tape and the tape bearing surface of the central portion.
- An illustrative tape wrap angle is between about 0.5° to about 2°.
- the angle ⁇ ( FIG. 3 ) of the tape bearing surface of the trailing outer portion 312 is adapted for skiving air from the magnetic medium when the magnetic medium travels as shown.
- the guides are oriented relative to the tape bearing surface of the nearest portion of the head with no wrap or a slight underwrap angle ⁇ (as shown in FIG. 3 ), which directs the medium to fly over the leading outer portion 310 with minimal (e.g., less than the at-rest) or no contact.
- the tape engages the leading edge 322 of the tape bearing surface of the central portion, and engages the inner edge of the tape bearing surface of a trailing one of the outer portions.
- An illustrative angle ⁇ between the medium in tension extending from the guide to the nearest outer portion and the tape bearing surface of the outer portion may be 0° to about 0.75°.
- the outer edge 324 of the tape bearing surface of the leading outer portion 310 is non-skiving, i.e., the outer edge of the leading outer portion does not skive air from the medium. This is a result of the guides being positioned as noted above. This is because the tape is spaced from the outer edge of the leading outer portion (slightly underwrapped), an air wedge develops, causing the medium to fly above the inner edge 318 of the leading outer portion.
- the outer edges of the tape bearing surfaces of the outer portions may be shaped, e.g. having a beveled edge 350 as shown on the outer portion 312 of FIG. 3 .
- the beveled edge 350 encourages formation of an air wedge between the tape and the tape bearing surface, thereby allowing a broader set of approach angles for the tape, and/or allowing use of a no-wrap or even slightly overwrapped design where the tape approaches the leading outer portion in a plane parallel to or nearly parallel to the tape bearing surface of the leading outer portion.
- the medium peels off the trailing outer portion 312 as it approaches the outer edge 326 of the trailing outer portion. Thus, little or no running friction is observed at the outer edge 326 of the trailing outer portion. It should also be noted that guide position is generally adjusted to ensure that the medium does not peel off so close to the downstream transducers that an intolerable spacing loss occurs.
- At least one of the portions has patterning for inducing the magnetic medium to fly thereover in an area away from the transducers and/or to reduce stiction of the medium to the tape bearing surface of the portion (as compared to a smooth, planar tape bearing surface).
- patterning include texturing, beveling of sections of the tape bearing surface edge, formation of ridges or ribs thereon, formation of channels therein, etc.
- FIGS. 6 and 7 illustrate an example of a central portion 316 having patterning as can be achieved by tape lapping. In a tape lapping process, a tape having abrasive sections, e.g., of diamond, alumina, etc. is drawn over the portion to selectively abrade areas thereof.
- the abrasive tape would have abrasive strips flanking a central nonabrasive strip.
- areas 328 of edges of the tape bearing surface 330 not aligned with the transducers 332 become beveled.
- the beveling promotes entrainment of air between the medium and the tape bearing surface.
- the sections of the edges of the tape bearing surface aligned with the transducers is not significantly affected by the tape lapping, and therefore retains its ability to skive air from the tape.
- the central portion and outer portions have patterning with physical characteristics of being lapped by tape lapping.
- R-W-R read-write-read
- outer reading portions flank a single writing portion.
- the outer portions include one or more arrays of readers, while the center portion includes one or more arrays of writers.
- Variations on the head include a R-W-R head, a R-R-W head, a W-W-R head, etc.
- One or more servo readers may be positioned on one or more of the outer portions, the central portion, or a combination thereof.
- the array of transducers of the central portion includes a plurality of writers and at least one servo reader calibrated to the position of one or more of the writers of the central portion.
- Such an embodiment exhibits better positioning of tracks during writing. The ability to position the tracks more accurately enables inclusion of more tracks on the tape, which may translate into higher areal density.
- any known method of calibrating the servo to one or more nearby transducers may be used.
- the calibration may be performed magnetically, optically, etc. e.g., to determine a physical spacing between the servo and the transducer(s).
- Logic in the system then uses this measurement to precisely position the head relative to the servo tracks on the medium.
- the position of the guides may be adjustable or fixed.
- the position of the guides may be set during manufacture and fixed, while in others the guides may be adjusted in the field, while in yet others, the guides may be set during manufacture and can be later adjusted in the field. Any known mechanism to fix the guides or make them adjustable may be used.
- a method for setting a wrap angle includes adjusting a guide position to overwrap a magnetic tape over an outer edge off leading outer portion.
- the guide 304 may be positioned to create an overwrap at edge 324 .
- the trailing guide 306 may or may not be in an overwrap configuration.
- the magnetic tape is passed over the head, the tape traveling in a direction from the leading outer portion towards the trailing outer portion.
- the magnetic tape is read using the leading outer portion, and a wrap angle of the magnetic tape relative to the leading outer portion is adjusted until the tape is no longer readable.
- the guide 304 may be raised up until the tape pops off of the leading outer portion 310 . The position of the guide when the tape becomes no longer readable is determined.
- wrap angle ⁇ of about 0°.
- the “in use” wrap angle ⁇ to be used for data storage operations, is selected based on the determined position of the guide, and the guide is set to provide the selected wrap angle.
- an illustrative “in use” wrap angle ⁇ between the medium in tension extending from the guide to the nearest outer portion and the tape bearing surface of the outer portion may be 0° to about 0.75°, but could be higher.
- the selected wrap angle may be the same as or greater than the wrap angle provided by the guide when the tape becomes no longer readable.
- FIG. 8 illustrates a simplified tape drive which may be employed in the context of the present invention. While one specific implementation of a tape drive is shown in FIG. 8 , it should be noted that the embodiments of the previous figures may be implemented in the context of any type of tape drive system.
- a tape supply cartridge 820 and a take-up reel 821 are provided to support a tape 822 . These may form part of a removable cassette and are not necessarily part of the system.
- Guides 825 guide the tape 822 across a preferably bidirectional tape head 826 , of the type disclosed herein.
- Such tape head 826 is in turn coupled to a controller assembly 828 via a write-read cable 830 .
- the controller 828 controls head functions such as servo following, writing, reading, etc.
- An actuator 832 controls position of the head 826 relative to the tape 822 .
- a tape drive such as that illustrated in FIG. 8 , includes drive motor(s) to drive the tape supply cartridge 820 and the take-up reel 821 to move the tape 822 linearly over the head 826 .
- the tape drive also includes a read/write channel to transmit data to the head 826 to be recorded on the tape 822 and to receive data read by the head 826 from the tape 822 .
- An interface is also provided for communication between the tape drive and a host (integral or external) to send and receive the data and for controlling the operation of the tape drive and communicating the status of the tape drive to the host, all as will be understood by those of skill in the art.
- a magnetic data storage system guides a magnetic medium over a magnetic head at an angle at which the magnetic medium flies over a leading outer portion of the head, engages a leading edge of a tape bearing surface of a central portion of the head, and engages an inner edge of a tape bearing surface of a trailing outer portion of the head, where the inner edge of the tape bearing surface of the trailing outer portions skives air from the magnetic medium when the magnetic medium travels in a direction from the central portion towards the trailing outer portion.
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- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
Description
Claims (9)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US12/831,149 US8861132B2 (en) | 2010-07-06 | 2010-07-06 | Low friction tape head and system implementing same |
US14/468,251 US9299368B2 (en) | 2010-07-06 | 2014-08-25 | Low friction tape head |
US15/068,403 US9653109B2 (en) | 2010-07-06 | 2016-03-11 | Low friction tape head |
Applications Claiming Priority (1)
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US12/831,149 US8861132B2 (en) | 2010-07-06 | 2010-07-06 | Low friction tape head and system implementing same |
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US14/468,251 Division US9299368B2 (en) | 2010-07-06 | 2014-08-25 | Low friction tape head |
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US20120008234A1 US20120008234A1 (en) | 2012-01-12 |
US8861132B2 true US8861132B2 (en) | 2014-10-14 |
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US12/831,149 Expired - Fee Related US8861132B2 (en) | 2010-07-06 | 2010-07-06 | Low friction tape head and system implementing same |
US14/468,251 Expired - Fee Related US9299368B2 (en) | 2010-07-06 | 2014-08-25 | Low friction tape head |
US15/068,403 Active US9653109B2 (en) | 2010-07-06 | 2016-03-11 | Low friction tape head |
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US14/468,251 Expired - Fee Related US9299368B2 (en) | 2010-07-06 | 2014-08-25 | Low friction tape head |
US15/068,403 Active US9653109B2 (en) | 2010-07-06 | 2016-03-11 | Low friction tape head |
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Cited By (3)
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US9299368B2 (en) | 2010-07-06 | 2016-03-29 | International Business Machines Corporation | Low friction tape head |
US9343097B2 (en) | 2012-08-31 | 2016-05-17 | International Business Machines Corporation | Method of forming magnetic recording head having protected reader sensors and near zero recession writer poles |
US9449619B1 (en) * | 2015-12-11 | 2016-09-20 | International Business Machines Corporation | Direction dependent tape head assembly to reduce tape-head friction |
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JP5685045B2 (en) * | 2010-01-22 | 2015-03-18 | 富士フイルム株式会社 | Servo write head, servo writer, and manufacturing method of magnetic tape on which servo signal is written |
CN103890845A (en) * | 2011-11-16 | 2014-06-25 | 惠普发展公司,有限责任合伙企业 | Operation of tape drives |
US9208809B2 (en) | 2013-05-01 | 2015-12-08 | International Business Machines Corporation | Magnetic head and system having offset arrays |
US9449628B2 (en) | 2013-05-01 | 2016-09-20 | International Business Machines Corporation | Quasi-statically oriented, bi-directional tape recording head |
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Also Published As
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US20160196850A1 (en) | 2016-07-07 |
US9653109B2 (en) | 2017-05-16 |
US20120008234A1 (en) | 2012-01-12 |
US20140362473A1 (en) | 2014-12-11 |
US9299368B2 (en) | 2016-03-29 |
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